.jumbotron {
    background: url(../images/pattern.png) repeat, white url(../images/data.jpg) 30% -80px no-repeat fixed;
    color: white;
    min-height: 350px;
}

@media only screen and (min-width: 768px) {
    .jumbotron {
        background: url(../images/pattern.png) repeat, white url(../images/data.jpg) 50% 200%/cover no-repeat fixed;
        min-height: 450px;
    }
}